Keith Curle has issued a High Court claim for damages against Mansfield. He was initially suspended as Mansfield boss in December, then sacked following an internal club investigation.
Curle, now Chester boss, has maintained his innocence and has been supported by the League Managers' Association.
Now Curle and his LMA legal team have issued a claim for "damages for express and implied terms of his contract and a declaration for clearance of his name".
Curle said: "The declaration basically means I want to be publicly exonerate of any wrongdoing. Beyond that there's nothing I can really add because it's in the hands of the LMA's lawyers."